Ipad connectivity help please

I know it's a bit premature, but I am looking for some advice, pros and cons. I waited for the ipad 2 and am curious as to how I will connect to the internet. I plan on buying an iphone 5 so again I know the equation could change. I guess I am wondering if I really need 2 devices with data plans. What would I lose performance-wise if I tethered my ipad to my phone. Does anyone have any experience using both methods and what I may lose by tethering?

None. Maybe a few milliseconds of transfer time. 802.11n is near-as-to-infinitely faster than any data connection you'll be getting with cellular telephony, so you should get the full speed thereof.

So Tallest, if you see this, what are your impressions of Ipad2? Also, it seems wiser to get the wi-fi 64 version and connect through a 4g hotspot iphone4 or 5. Or am I missing something? I was going to buy the wireless carrier connectivity if it supported both Verizon and ATT but it looks like these will be separate products.